<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>html表格</title>
</head>
<body>
    <table border="1" style="width: 400px;margin: 100px auto;" cellspacing="0">
        <thead>
            <tr style="background-color: #4cae4c;color: white;">
                <th>学号</th>
                <th>姓名</th>
                <th>年龄</th>
                <th colspan="3">操作</th>
            </tr>
        </thead>
        <tbody style="text-align: center;">
            <tr>
                <td>1</td>
                <td>张三</td>
                <td>22</td>
                <td>增加</td> 
                <td>删除</td>
                <td>修改</td>
            </tr>
            <tr>
                <td>2</td>
                <td>李四</td>
                <td>23</td>
                <td>增加</td>
                <td>删除</td>
                <td>修改</td>
            </tr>
        </tbody>
    </table>
</body>
</html>